CouchDB Pumper- a data migration tool from Oracle to CouchDB and back.

couch-to-postgres - Node libary to stream CouchDB changes into PostgreSQL (similar to ElasticSearch river). Uses PostgreSQL JSON datatype and enables SQL querying on docs. With the pgsql-http extension allows for inserts/updates/deletes from within PostgreSQL on docs within CouchDB and can be used as a general swiss army knife for manipulating CouchDB databases. With PostgreSQL ODBC allows excel/access to query the docs as well.